How to communicating one application with another?

I wanted to make a web site that have the ability to view,update,insert and delete record in a database. How to do that? How can one application communicate with another? example, I wanted to have XHTML communicate with Java and Java to communicate with my database that is pointbase database.

Multi-tier application communication is a somewhat complex matter. It may be made using differents techniques and designs. But like Sum-shusSue said, a typical Java-based solution would use these Java technologies: JSP (Java Server Page) for the presentation side (the client), Servlet or EJB (Enterprise Java Bean) for the server-side logic. The communication with the Database is made through JDBC.
I suggest that you take a look at the J2EE edition of Java. That stands for Java 2 Enterprise Edition and it is specifically made for enterprise system development, such as Servlet, JSP, EJB, etc...
This is a whole lot of new subjects and, from my humble experience, it is not that easy. i.e. I would not recommend it for strict newbies. However, if you have some months of Java coding on your side, maybe you should take a look. You can check first the left menu of this site, you'll find, under Technologies the sub-menu J2EE. There's also, somewhere on the site, tutorials on differents J2EE topics. Finally, I would recommend you this book:
Professional Java Server Programming, J2EE 1.3 Edition, edited by Wrox. Of course, there a lot of other books on hte market. J2EE is a hot topic!
Hope this help...
Simon

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